VAR_SW            593 libavfilter/vf_blend.c     values[VAR_SW] = td->w / (double)td->dst->width;
VAR_SW            386 libavfilter/vf_geq.c     values[VAR_SW] = geq->values[VAR_SW];
VAR_SW            447 libavfilter/vf_geq.c         geq->values[VAR_SW] = width / (double)inlink->w;